Alert archive / Arizona / Flash Flood Warnings in 2021
Flash Flood Warning 69, NWS Phoenix, AZ
NWS Phoenix, AZ issued this flash flood warning at Jul 23, 2021, 10:53 AM MST for Maricopa County, Arizona. It was in force for 4 hr. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jul 23, 2021, 10:53 AM MST (17:53 UTC)
- Expired
- Jul 23, 2021, 2:36 PM MST
- In force
- 4 hr
- Issued by
- NWS Phoenix, AZ
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County Maricopa County, AZ
The radar
The Phoenix radar (KIWA), 47 km from the middle of the area, began a volume at 17:55 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 23, 11:11 AM MST | FLASH FLOOD | 1 Ne Fountain Hills, AZ | VIDEO SHOWS ASHBROOK WASH WITH FLOWING WATER NEAR SAGUARO BLVD. AND FOUNTAIN HILLS BLVD. |
| Jul 23, 12:09 PM MST | FLASH FLOOD | 2 Ene Fountain Hills, AZ | VIDEO SHOWS FLOWING WATER FROM ASHBROOK WASH OVERTAKING N. DEL CAMBRE AVE NEAR E. GRANDE BLVD. ROAD IMPASSABLE. |
| Jul 23, 1:35 PM MST | FLASH FLOOD | 10 Nne Fountain Hills, AZ | NEEDLEROCK RD. NORTH OF RIO VERDE DR. CLOSED DUE TO FLOODING. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 5.9 hours before the alert went out and 170 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 503 J/kg
- Mixed-layer CIN
- -51 J/kg
- Mixed-layer LCL
- 915 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 45 m²/s²
- 0-3 km storm-relative helicity
- 109 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
111
WGUS55 KPSR 231753
FFWPSR
AZC013-232200-
/O.NEW.KPSR.FF.W.0069.210723T1753Z-210723T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Phoenix AZ
1053 AM MST Fri Jul 23 2021
The National Weather Service in Phoenix has issued a
* Flash Flood Warning for...
Maricopa County in south central Arizona...
* Until 300 PM MST.
* At 1053 AM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
* Some locations that will experience flash flooding include...
Scottsdale, Fountain Hills, Rio Verde, McDowell Mountain Park and
Fort McDowell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3356 11169 3353 11183 3363 11187 3369 11188
3385 11182 3390 11163 3390 11150 3374 11154
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MS2 follow-up statements
807
WGUS75 KPSR 231837
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
1137 AM MST Fri Jul 23 2021
AZC013-232200-
/O.CON.KPSR.FF.W.0069.000000T0000Z-210723T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
1137 AM MST Fri Jul 23 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 3 PM MST THIS
AFTERNOON FOR MARICOPA COUNTY...
At 1137 AM MST, Doppler radar indicated thunderstorms producing
heavy rain across the warned area. Between 0.5 and 1 inch of rain
has fallen. Flash flooding is ongoing with a Skywarn Spotter
reporting rapid rise in Ashbrook Wash in Fountain Hills.
HAZARD...Life threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life threatening flash flooding of creeks and streams,
urban areas, highways, streets and underpasses.
Some locations that will experience flash flooding include...
Scottsdale, Fountain Hills, Rio Verde, McDowell Mountain Park and
Fort McDowell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3356 11169 3353 11183 3363 11187 3369 11188
3385 11182 3390 11163 3390 11150 3374 11154
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
MS461
WGUS75 KPSR 232136
FFSPSR
Flash Flood Statement
National Weather Service Phoenix AZ
236 PM MST Fri Jul 23 2021
AZC013-232146-
/O.CAN.KPSR.FF.W.0069.000000T0000Z-210723T2200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
Maricopa AZ-
236 PM MST Fri Jul 23 2021
...FLASH FLOOD WARNING IS CANCELLED FOR MARICOPA COUNTY...
Flood waters have receded. The heavy rain has ended. Flooding is no
longer expected to pose a threat. Please continue to heed remaining
road closures.
A Flash Flood Watch remains in effect until 1200 AM MST Monday for a
portion of south central Arizona.
A Flash Flood Watch remains in effect until 1200 AM MST Monday for a
portion of south central Arizona.
LAT...LON 3356 11169 3353 11183 3363 11187 3369 11188
3385 11182 3390 11163 3390 11150 3374 11154
$$
MSThe office that day
Everything else NWS Phoenix, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 22, 5:42 PM MST | Special Weather Statement | PSR | 48 min | |
| Jul 22, 6:11 PM MST | Areal Flood Advisory | PSR | Maricopa | 39 min |
| Jul 22, 6:31 PM MST | Special Weather Statement | PSR | 59 min | |
| Jul 22, 6:50 PM MST | Flash Flood Warning | PSR | Maricopa | 6 hr |
| Jul 22, 7:19 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 22, 7:29 PM MST | Special Weather Statement | PSR | 61 min | |
| Jul 22, 7:40 PM MST | Severe Thunderstorm Warning | PSR | Pinal | 35 min |
| Jul 22, 7:46 PM MST | Flash Flood Warning | PSR | Maricopa | 5 hr |
| Jul 22, 7:48 PM MST | Dust Storm Advisory | PSR | Maricopa, Pinal | 27 min |
| Jul 22, 7:53 PM MST | Special Weather Statement | PSR | Pinal | 37 min |
| Jul 22, 7:55 PM MST | Areal Flood Advisory | PSR | Maricopa, Pinal | 5 hr |
| Jul 22, 8:05 PM MST | Special Weather Statement | PSR | Maricopa | 25 min |
| Jul 22, 8:06 PM MST | Flash Flood Warning | PSR | Pinal | 4 hr |
| Jul 22, 8:15 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 22, 8:19 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 26 min |
| Jul 22, 8:29 PM MST | Special Weather Statement | PSR | Pinal | 61 min |
| Jul 22, 8:39 PM MST | Special Weather Statement | PSR | Maricopa | 51 min |
| Jul 22, 8:52 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 22, 8:56 PM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 22, 9:28 PM MST | Special Weather Statement | PSR | Maricopa | 47 min |
| Jul 22, 9:40 PM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Jul 22, 9:45 PM MST | Flash Flood Warning | PSR | Maricopa | 3 hr |
| Jul 22, 9:49 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 22, 9:54 PM MST | Flash Flood Warning | PSR | Gila, Maricopa | 4 hr |
| Jul 22, 10:07 PM MST | Flash Flood Warning | PSR | Gila, Maricopa, Pinal | 4 hr |
| Jul 22, 10:16 PM MST | Areal Flood Advisory | PSR | Pinal | 3 hr |
| Jul 22, 10:57 PM MST | Flash Flood Warning | PSR | Maricopa | 113 min |
| Jul 22, 11:15 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 22, 11:29 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 22, 11:43 PM MST | Flash Flood Warning | PSR | Gila | 4 hr |
| Jul 23, 4:37 AM MST | Areal Flood Advisory | PSR | Maricopa | 3 hr |
| Jul 23, 8:37 AM MST | Areal Flood Warning | PSR | Gila | 4 days |
| Jul 23, 9:07 AM MST | Special Weather Statement | PSR | 38 min | |
| Jul 23, 9:30 AM MST | Special Weather Statement | PSR | 30 min | |
| Jul 23, 9:55 AM MST | Areal Flood Warning | PSR | Maricopa | 6 hr |
| Jul 23, 9:58 AM MST | Special Weather Statement | PSR | 32 min | |
| Jul 23, 10:31 AM MST | Special Weather Statement | PSR | 29 min | |
| Jul 23, 11:11 AM MST | Special Weather Statement | PSR | 34 min | |
| Jul 23, 11:46 AM MST | Special Weather Statement | PSR | 29 min | |
| Jul 23, 12:02 PM MST | Special Weather Statement | PSR | 28 min | |
| Jul 23, 12:09 PM MST | Flash Flood Warning | PSR | Maricopa | 6 hr |
| Jul 23, 12:30 PM MST | Special Weather Statement | PSR | 30 min | |
| Jul 23, 12:53 PM MST | Special Weather Statement | PSR | 37 min | |
| Jul 23, 1:01 PM MST | Special Weather Statement | PSR | 29 min | |
| Jul 23, 1:11 PM MST | Flash Flood Warning | PSR | Maricopa | 5 hr |
| Jul 23, 1:34 PM MST | Special Weather Statement | PSR | 26 min | |
| Jul 23, 2:25 PM MST | Flash Flood Warning | PSR | Maricopa | 4 hr |
| Jul 23, 3:20 PM MST | Areal Flood Warning | PSR | Maricopa | 9 hr |
| Jul 23, 4:00 PM MST | Areal Flood Warning | PSR | Maricopa | 8 hr |
| Jul 23, 4:02 PM MST | Areal Flood Warning | PSR | Maricopa | 8 hr |
Nearby
Flash Flood Warnings in Arizona, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.